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Topic: gs400/425 compatability with 450. (Read 472 times)

:dunno_black:Hi guys, I'm in the UK and am looking at a long term project,there is a race class here in the classic club for pre 81 aircooled up to500cc bikes, my thought is to use a gs400/425 with the roller bearing crank ( stronger?) & then use 450 barrels/pistons to get close to 500 with maybe the same head.are the barrels a straight fit from 450 to earlier motors & are later valves/heads ant better tham earlier ones, any info or sugestions would be gratefully received.cheers herb.will the barrel/piston of the 450 fit a 400?? what about the head?